# Question #c4ed5

##### 1 Answer

Nov 11, 2016

We know

Where R represents the resistance of an ohmic conductor of length l and cross sectional area A and

Now we consider the situation when the V potential difference is applied across the ends of the conductor.Let I be the current flowing through it. In this situation the electric field acting with in the conductor is

Multiplying both sides of (1) by **I** we get

By ohm's law

This equation shows that resistivity (